8Brown,H Principles of Language Learning and Teaching (2nd Ed.)[M]. Englewood Cliffs,NJ: Prentice-Hall,1987.
9Femando Poyatos. Paralanguage: A finguistic and interdisciplinary approach to interactive speech and sound[M]. Amsterdam/ Philadelphia:Johan Benjamins Pubfishing Company, 1993.
10Bialystok,E Communication Strategies: A Psychological Analysis of Second-Language Use [M]. Cambridge:Cambridge University Press,1990.